package com.atguigu.springcloud.controller;

import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.lb.LoadBalancer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.net.URI;
import java.util.List;

@RestController
@Slf4j
public class OrderController {

//    public static final String PAYMENT_SERVER_URL = "http://localhost:8001";
    public static final String PAYMENT_SERVER_URL = "http://CLOUD-PAYMENT-SERVICE";
    public static final String SERVICE_ID = "CLOUD-PAYMENT-SERVICE";

    @Autowired
    private RestTemplate restTemplate;

    //可以获取注册中心上的服务列表
    @Resource
    private DiscoveryClient discoveryClient;
    @Resource
    private LoadBalancer loadBalancer;

    @GetMapping(value = "/consumer/payment/create")
    public CommonResult<Payment> create(Payment payment){
        return restTemplate.postForObject(PAYMENT_SERVER_URL+"/payment/create",payment,CommonResult.class);
    }

    // getForObject
    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult<Payment> getPayment(@PathVariable Long id)
    {
        return restTemplate.getForObject(PAYMENT_SERVER_URL + "/payment/get/"+id, CommonResult.class, id);
    }

    /****************************************************************************************/
    @GetMapping(value = "/consumer/payment1/get/{id}")
    public CommonResult<Payment> getPayment1(@PathVariable(value = "id") Long id){
        URI uri = getUri();
        if (uri == null) return null;
        System.out.println("***uri***"+uri);
        return restTemplate.getForObject(uri+"/payment/get/"+id,CommonResult.class,id);
    }

    /**
     * 根据自己写的负载均衡算法，获取一个微服务实例的服务器地址（访问地址）
     * @return
     */
    private URI getUri() {
        List<ServiceInstance> instances = discoveryClient.getInstances(SERVICE_ID);
        if(instances == null || instances.size() <= 0){
            return null;
        }
        ServiceInstance serviceInstance = loadBalancer.instances(instances);
        URI uri = serviceInstance.getUri();
        return uri;
    }
    /****************************************************************************************/

    // getForEntity
    @GetMapping(value = "/consumer/payment/getForEntity/{id}")
    public CommonResult<Payment> getPayment2(@PathVariable(value = "id")Long id){
        ResponseEntity<CommonResult> entity = restTemplate.getForEntity(PAYMENT_SERVER_URL + "/payment/get/" + id, CommonResult.class);
        if(entity.getStatusCode().is2xxSuccessful()){
            System.out.println(entity.toString());
            return entity.getBody();
        }else{
            return new CommonResult<>(444,"操作失败");
        }
    }

    @GetMapping(value = "/getAvailableService")
    public Object getAllService(){
        return restTemplate.getForObject(PAYMENT_SERVER_URL+"/payment/discovery",Object.class);
    }






    ////////////////////////////////////////////////////////////////////////////////////////////////
    @GetMapping("/consumer/payment/lb")
    public String getPaymentLB()
    {
        List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");

        if(instances == null || instances.size()<=0) {
            return null;
        }
        ServiceInstance serviceInstance = loadBalancer.instances(instances);
        URI uri = serviceInstance.getUri();
        System.out.println("----uri----"+uri);

        return restTemplate.getForObject(uri+"/payment/lb",String.class);
    }

    // ====================> zipkin+sleuth
    @GetMapping("/consumer/payment/zipkin")
    public String paymentZipkin()
    {
        String result = restTemplate.getForObject("http://localhost:8001"+"/payment/zipkin/", String.class);
        return result;
    }
}
